code: def get_index_label_pos(index, extent, origin, inverted_xindex):
      """
      Return the desired position and horizontal alignment of an index label.
      """
      if extent is None:
          extent = lookup_extent(origin)
      left, right, bottom, top = extent
      x, y = index_to_coordinate(index, extent, origin)
  
      is_x0 = index[-2:] == "0]"
      halign = "left" if is_x0 ^ inverted_xindex else "right"
      hshift = 0.5 * np.sign(left - right)
      x += hshift * (1 if is_x0 else -1)
      return x, y, halign
  
file_path: matplotlib/galleries/users_explain/artists/imshow_extent.py
imports: import matplotlib.pyplot
  import numpy
  from matplotlib.gridspec import GridSpec
label_desc: Use image node_id 2 for calling a global function with example usage: get_index_label_pos(index, extent, origin, inverted_xindex) and returns: x,  y,  halign